Power pumping head



May 20, 1924.

I M. S. PARSONS POWER PUMPING HEAD Filed June 7 1922 3 Shees-$heet l IZ6 2%, Z,

l O c gnue n l'oz May 20, 1924. 1,494,624

M. s. PARSONS POWER PUMPING HEAD Filed June 7 W22 5 Sheets-Sheet 2 "*1 I/0 4 W z "nl m I If Z5 45 May 20, 1924.

M. s. PARSONS POWER PUMPING HEAD Filed June 7 1922 3 Sheets-Sheet 5gwomatoz Patented May 29, 1924.

warren "stares MARION s. reasons,

when

or JOPLIN, MISSOURI.

POWER. PUMPING HEAD.

Application filed June 7,

whereby there will be a lap in the movement of the piston rods that is,whereby each piston rod will move upwardly, at the time that the reversein themo'vement of the other piston rod takes place, thereby avoidingall jar and shock, the above mentioned result being brought aboutthrough the instrumentality of a simple combination of parts, and

by a straight crank mechanism.

Although I have shown in the drawings, one form which the invention maytake, it

will be understood that, within the scope of what is claimed, amechaniomay make alterations in the structure shown, without departingfrom the spirit of the invention. In the drawings Figure 1 shows, inelevation, a device constructed in accordance with the invention;

Figure 2 is a top plan; Figure 3is a front elevation wherein parts arebroken away; and Figures 4 to 9 are diagrams showing the relativepositions of the parts, throughout the cycle of the operation. p

The numeral 1 marks a frame, carrying any desired sort of operatingmechanism,

such as a drive shaft 2 providedwith pin ions 3 meshing into gear wheelsat on a shaft 5 journaled on the frame, the shaft having a crankwhereunto a pitman 7is pivoted as shown at 26, the pitman 7 beingpivoted at 27 to one arm 8 of a bell crank lever 15 embodying an arm 9.Crank pins 10 are carried by the gear wheels 4 and are located in astraight line passing through the axis of the shaft 5 and the pivotpoint 26 between the crank 6 and the pitman 7. The pitmans 11 arepivoted at 28 to arms 12 forming part of hell cranks 16 including arms14;. A rod or support 17, mounted on the frame 1, forms a fulcrum forthe bell crank levers 15 and 16. i

The numeral 18 marks a pump cylinder 1 S. PARSONS,

1922. -Seria1 No. 566,627. g

and at 1.9 there is shown a vertical guide which may be mounted on thepump cylinder and on the frame 1. The upper ends of 1 links 20 arepivoted at 30 to the arms 14 of thebell crank levers l6 and are pivotedat their lower ends to a cross head 21, mounted to reciprocate on theguide 19 and connected to a hollow piston rod 22 mountedto reciprocatein the cylinder .18. A cross head 23 reciprocates on the guide 19 andcarries a piston rod 24 which reciprocates in the piston rod 22. A link25 is pivoted to the upper end of the rod 24 and is pivoted at 29 to thearm 9 of the bell. crank lever 15.

The shaft 5 and the gear wheels lunaybe alluded to as a rotatablemember, having crank elements 10 and 26 which are located 180 degreesapart, thisportion of the device cooperating with other parts thereof,to

prpduce a lap in the movement of the piston re s. i I

When rotation is imparted to the drive shaft 2, the pinions 3 willimpart rotation to the shaft 5 byway of the gear wheels 1, the crank 6will operate the bell crank lever 15 by way of the pitman 7, and thewrist pins 10 on the *gear wheels l, acting through the pitmans 11, willoperate the bellcrank levers 16, the bell crank levers 15 and 16 tiltingontheir fulcrum 17.. From the arm 9 of the bell crank lever 15, motionwill be transmitted to the piston rod 2 1 by way of the link 25, andfrom the arms 14 ofthe bell crank levers l6,"motion will be transmittedto the links 20 and to the piston rod22. One

rod moves upwardly at slow speed, to lift the liquid which is beingpumped. whilst the other piston rod is moving downwardly. The generalconstruction of the device'is such that there is 'alap in the movementof the piston rods 24 and 22, that is, there is never a time when theliquid is not being lifted by one piston rod or the other, means beingprovided whereby there is a lap in the movement of each piston. rod, atthe time when the reversal in the direction of move ment of the otherpiston rod takes place The digrammatic figures which are num bered 4 to9 illustrate when and how the lap takes place, and point out, also. howthe upward movement of the rod at slow speed, and the quick downwardmovement thereof are brought about;

The device forming the subject matter of this application is a doublelap-stroke pump, having two distinct bell crank movements,

iii

these movements being produced without resorting to complicated devicesof any kind. The bell cranks are operated from crank pins set 180degrees apart, and motion is transmitted to each bell crank in such away as to make it impossible for it to move, except in a changeableposition, losing its center at the first movement ofthe actuating crankpin, and coming back to alinement with the crank pin once only, in everyrevolution. This movement takes place alternately, and the bell cranklevers are operated in this manner, alternately.

The short arms of the bell crank levers, for instance, the arm 12 of thebell crank lever '16 never swings to the left (Figure 1) beyond avertical plane passing through the fulcrum point 17 If the crank pin 10and the arm 12 be considered, it will be obvious that if the arm 12werethree feet long, the point 28 would have a six foot throw providedthat the said point moved through a full circle. In the device formingthe subject matter of this application only so much of thiscircumference is used as results from the throw of the crank pin 10 andthis throw of the crank pin 10 need notbe more than eighteen inches.Only so much of a circumference described from the point 17- With aradius represented by the arm 12 is used, as produces, virtually, astraight line up and down movement in the piston rod. As a result, thelateral movement of the point 29, for instance, is very small and it isunnecessary to provide an extensive or elaborate cross head system. Thevariable speed resulting from the operation of the crank points 10 and26 is neutralized, and each pump rod makes its down stroke at a speedwhich approaches uniformity, and

makes its upstroke at a speed which approaches uniformity, the rod,however, moving downwardly, at a comparatively high speed, asdistinguished from the relatively low speed at which the rod movesupwardly.

The structure shown and described is simple in construction and requiresno fly wheels to carry the parts over center. Many-objectionable crosshead features commonin other pumps have been eliminated. The upwardstroke of the plunger rod is slow and even, the downward stroke beingrapid. Any

stroke required may be secured, even between such wide limits as fromsix inches to twelve feet. The design of the device is such that it maybe applied to pumps of any size and horse power, the generalconstruction remaining unchanged, the alterations being made merely inthe weight of the parts, to accommodate them to the duty which is to beperformed.

It is to be observed that all of the stroke takes place above ground,although the stroke is long, no pit being necessary. A glance at Figure1 will demonstrate the fact that there will be practically no diflicultyin lining up the parts, when the pump is set up.

I claim In a device of the class described, bell crank levers having acommon fulcrum, the levers comprising long arms which extend in the samegeneral horizontal direction from the fulcrum, and short arms whichextend downwardly from the fulcrum, and means for causing the long armsto swing upwardly above and downwardly below a horizontal plane passingthrough thefulcrum, and for causing the short arms to' swing through anare which terminates at a vertical plane passing through the fulcrum,said means comprising crank elements having a common axis of rotation,and pitmans connecting the crank elements with the short arms of'thebell crank levers, the points of connection between the itmans and thecrank elements being located in a straight line which is approximatelyat right angles to the short arm of one bell crank lever when said armis in a vertical depending position, said points being below ahorizontal plane passing through the connection between said short armand its pitman when said short arm is in a vertical depending position,and means for connecting the long arms operatively with pump rods or thelike.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

MARION S. PARSONS.

Witnesses:

F. L. SEARCH, MAsoN B. LAWTON.

